Please include all calculations.. Determine, mathematically, the design buckling resistance moment of the simple supported beam, $35651$kg$/$m UB$,$ laterally and torsionally restrained at the supports and B$,3$m from the support at A based on a UDL which results in the bending moment as shown in figure $3$ below.

Bending Moment at $B=187\mathrm{.}5kNm,$ Max Bending Moment $($at midspan$)=200kNm$

Assume UDL loading throughout.

Loads are not destabilising.

Figure $3$